Re: bdf hangs

I too would suspect a stale NFS mount. Do you have another server that this machine mounts file systems from? You might be able to make that server available again, thus freeing up you bdf hang. Many times, however, the only answer is to reboot.

Re: bdf hangs

From 11i v2 onwards there is a -f switch to forcibly umounting NFS shares, it might work in some cases. If you have 11i v2 and no -f option then install the patch PHKL_31500 - which, in case also needs a reboot.